Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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ARE STORM-TIME SUBSTORMS TRIGGERED OR SPONTANEOUS?

  • Lee D.Y. (Department of Astronomy and Space Science, College of Natural Sciences and Institute for Basic Sciences Chungbuk National University) ;
  • Kim H.J. (Department of Astronomy and Space Science, College of Natural Sciences and Institute for Basic Sciences Chungbuk National University) ;
  • Choi C.R. (Department of Astronomy and Space Science, College of Natural Sciences and Institute for Basic Sciences Chungbuk National University)
  • Published : 2004.12.01
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Abstract

Magnetic storms are almost always accompanied with substorms or substorm-like disturbances. Understanding the nature of the storm-time substorm is important for the currently critical issue of the storm-substorm relation. In this work we have done a statistical analysis in a straightforward way to see whether the storm-time substorms are preferably spontaneous or triggered. On the basis of 301 storm-time substorms selected for this work, we have found that the occurrence of about $28\%$ of them was spontaneous while only $6.5\%$ were associated with a clear trigger(s). The rest of the events were mostly associated with complex variations of IMF. The significant percentage for the spontaneous substorms implies that the possibility of finding a storm without a substorm is greatly reduced due to the spontaneous occurrence of the substorm even when the solar wind and IMF condition remains completely steady during the storm time.

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References

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